Indian Red: Originally a natural more purple iron oxide imported from India. First synthesized in the 18th century as a "Mars" color, contemporary Indian Red is very dense purplish red with great hiding power. Most commonly used to underpaint automobiles.Pigment: Synthetic red iron oxide (bluish shade) (PR 101), Vehicle: Alkali refined linseed oilLightfastness I, Series 1, OPAQUE, MSDS